Symptoms typically involve lack of hand-eye coordination, a severely itchy nose, random loss of motor skills causing general speech to be difficult and generally spazziness. Infected individuals are often categorized as "awkward". Predominantly affects young females, but it is highly contagious and it is known to spread to males who have been in the same room as an infected female.
Example 1: She inhaled and she started choking, she must have the Yelsha Syndrome.
Example 2: It was only a matter of time before he contracted it, he's her best friend.
Example 2: It was only a matter of time before he contracted it, he's her best friend.
by Crazedcupcake March 13, 2013

by And Parasols October 23, 2013

When a character from a manga, anime, or other form of popular media breaks up with his/her lover for no apparent reason, often multiple times in a short period of time. The character with this alledged Yuki Syndrome is often of a cold and/or ass-ish personality.
Shuichi: "Hirooooo! Yuki broke up with me for the fiftieth time this week!!"
Hiro: "It's only Tuesday! He must have Yuki Syndrome."
Hiro: "It's only Tuesday! He must have Yuki Syndrome."
by MHMMM MMMKAY November 20, 2009

when someone has denial of being a catboy but becomes one anyways in the end. specifically xiao and venti
“CATBOYS ARENT REAL! I WILL NEVER BE A CATBOY.” venti pursued as xiao was firmly agreeing with him.
“…”
“what happened to venti and xiao?”
“they were in the denial stage of catboy syndrome.”
“…”
“what happened to venti and xiao?”
“they were in the denial stage of catboy syndrome.”
by hu.taq July 20, 2021

When a person is mentally retarded but decides to be a pretentious, know it all who has no flaws; and always want to point out the flaw of others. When someone is a complete moron but decides to talk as if they were the one smart enough to teach Albert Einstein quantum physics. A trend following zombie that is to busy to keep up with viral trends till the state of lose of all self individuality. Can be related with the stereotypical attitude of the average Student of MSU (Located in Shah Alam, Malaysia).
Person 1: "Hey man, I have seen you in forever! You still living in Shah Alam.?"
Person 2: "No, I moved. Shah Alam has too many people with MSU Syndrome. How do you even put up with living that close to dumb asses?"
Person 2: "No, I moved. Shah Alam has too many people with MSU Syndrome. How do you even put up with living that close to dumb asses?"
by Azalea Einstein February 17, 2017

"Hey Mike, how is Julian Wellsworth VI in the a capella group, president of his frat, president of the student body, vice president of the honors society, the star runningback, and the winner of the Pulitzer Prize this year, while still being an asshole and a giant douche?"
"I don't know. I guess he has Thacker syndrome."
"I don't know. I guess he has Thacker syndrome."
by Kz October 17, 2012

Symptoms include a "room temperature" IQ and incessant giggling. Sometimes mistaken for the village idiot.
by Y-7-9er February 7, 2013
